WSPR_630m 20180622

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     Peter Miles
     Northam, Western Australia
     QRZ Page: VK6YSF

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WSPR - 630m BAND - 18/06/2018 - 21/06/2018

WSPR 630m (472 - 479kHz) band activity data recorded for 3 x 24 hour period on the 18/06/2018 - 21/06/018 UTC.

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Data from the WSPR web site relating to monitoring and transmission from VK6YSF Northam Western Australia.

WSPR Frequency: Dial 474.2 kHz USB (occupied bandwidth 475.6 - 475.8 kHz)

Grid location: OF88II

Local Time = +8:00 hours (0:00 = 8:00AM)

RX Only

SSN (Sun Spot Number): 41

Equipment: TS-930 at 5W, Radio computer interface

Antenna: Active Antenna V-2

Monitoring comparative signal of VK3HP, VK3XHM, VK4YB and VK5FQ

WSPR 630m band activity data recorded for 3 x 24 hour period on the 18/06/2018 - 21/06/018 UTC showing SNR against UTC time, Vertical axis = dB below the noise floor. Shown are stations VK3HP, VK3XHM, VK4YB and VK5FQ.

Band appears to open between Northam, Western Australia and the east coast of Australia at around 17:45WST for approximately 5 hours.

Station	Power (dbm)	Power (Watts)	Distance km
VK3HP	30dbm	1W	2679
VK3XHM	27dbm	0.5 W	2685
VK4YB	37dbm	5 W	3523
VK5FQ	30dbm	1 W	2057

Screen shot shows the strong clear signal trace of VK5FQ and VK4YB (right).

Date	Time	Call	Frequency	SNR	Drift	Grid	Power dBm	Watts	Reported	loc	km
21/06/2018	14:02	VK4YB	0.475796	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:54	VK4YB	0.475796	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:50	VK4YB	0.475796	-20	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:46	VK4YB	0.475796	-24	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:40	VK4YB	0.475796	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:34	VK4YB	0.475796	-19	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:34	VK3HP	0.475611	-11	0	QF21nt	30	1	VK6YSF	OF88ii	2679
21/06/2018	13:28	VK4YB	0.475796	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:24	VK4YB	0.475796	-19	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:24	VK3HP	0.475611	-10	0	QF21nt	30	1	VK6YSF	OF88ii	2679
21/06/2018	13:20	VK3HP	0.475611	-14	0	QF21nt	30	1	VK6YSF	OF88ii	2679
21/06/2018	13:18	VK4YB	0.475796	-25	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:14	VK3HP	0.475611	-9	0	QF21nt	30	1	VK6YSF	OF88ii	2679
21/06/2018	13:12	VK4YB	0.475796	-24	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:08	VK4YB	0.475796	-24	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:08	VK3HP	0.475611	-18	0	QF21nt	30	1	VK6YSF	OF88ii	2679
21/06/2018	13:04	VK4YB	0.475796	-24	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	13:00	VK4YB	0.475796	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:56	VK4YB	0.475796	-27	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:52	VK4YB	0.475796	-21	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:46	VK4YB	0.475796	-20	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:42	VK4YB	0.475796	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:36	VK4YB	0.475796	-22	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:32	VK5FQ	0.475736	-14	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	12:30	VK4YB	0.475796	-22	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:26	VK4YB	0.475796	-22	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:22	VK4YB	0.475796	-26	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:22	VK5FQ	0.475736	-18	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	12:18	VK4YB	0.475796	-18	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:14	VK4YB	0.475796	-21	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:12	VK5FQ	0.475736	-14	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	12:08	VK4YB	0.475796	-22	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:02	VK4YB	0.475796	-12	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	12:02	VK5FQ	0.475736	-22	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	11:54	VK4YB	0.475796	-13	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	11:52	VK5FQ	0.475736	-15	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	11:50	VK4YB	0.475796	-14	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	11:46	VK4YB	0.475796	-19	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	11:42	VK5FQ	0.475736	-10	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	11:40	VK4YB	0.475796	-11	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	11:36	VK4YB	0.475796	-18	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	11:32	VK5FQ	0.475736	-16	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	11:30	VK4YB	0.475796	-18	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	11:26	VK4YB	0.475796	-15	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	11:22	VK5FQ	0.475736	-18	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	11:12	VK5FQ	0.475736	-15	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	11:04	VK4YB	0.475796	-18	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	11:02	VK5FQ	0.475736	-17	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	11:00	VK4YB	0.475796	-17	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:56	VK4YB	0.475796	-11	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:52	VK4YB	0.475796	-19	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:52	VK5FQ	0.475736	-21	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	10:46	VK4YB	0.475796	-14	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:42	VK5FQ	0.475736	-18	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	10:42	VK4YB	0.475796	-15	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:38	VK4YB	0.475796	-20	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:32	VK4YB	0.475796	-20	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:32	VK5FQ	0.475736	-23	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	10:28	VK4YB	0.475796	-19	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:24	VK4YB	0.475796	-18	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:22	VK5FQ	0.475736	-16	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	10:14	VK4YB	0.475796	-15	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:12	VK4YB	0.475796	-14	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:12	VK5FQ	0.475736	-19	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	10:10	VK4YB	0.475797	-13	-1	QG62ku	37	5.012	VK6YSF	OF88ii	3523
21/06/2018	10:02	VK5FQ	0.475736	-12	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	9:52	VK5FQ	0.475736	-17	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	9:42	VK5FQ	0.475736	-21	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	9:32	VK5FQ	0.475736	-13	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	9:22	VK5FQ	0.475736	-17	0	PF95gc	30	1	VK6YSF	OF88ii	2057
21/06/2018	9:20	VK4YB	0.475796	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	13:02	VK4YB	0.475797	-24	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:58	VK4YB	0.475797	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:54	VK4YB	0.475797	-26	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:44	VK4YB	0.475797	-27	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:42	VK5FQ	0.475736	-14	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	12:40	VK4YB	0.475797	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:36	VK4YB	0.475798	-13	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:34	VK4YB	0.475798	-17	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:32	VK5FQ	0.475736	-19	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	12:30	VK4YB	0.4758	-17	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:24	VK4YB	0.475796	-21	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:22	VK5FQ	0.475736	-15	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	12:20	VK4YB	0.475796	-13	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:18	VK4YB	0.475797	-15	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:14	VK4YB	0.475798	-18	-1	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:12	VK5FQ	0.475736	-15	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	12:06	VK4YB	0.475796	-11	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:02	VK4YB	0.475796	-17	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	12:02	VK5FQ	0.475736	-9	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	11:54	VK4YB	0.475796	-13	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	11:52	VK5FQ	0.475736	-12	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	11:50	VK4YB	0.475796	-17	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	11:46	VK4YB	0.475796	-21	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	11:42	VK5FQ	0.475736	-8	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	11:38	VK4YB	0.475797	-14	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	11:34	VK4YB	0.475797	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	11:32	VK4YB	0.475798	-11	-1	QG62ku	37	5.012	VK6YSF	OF88ii	3523
20/06/2018	11:32	VK5FQ	0.475736	-17	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	11:22	VK5FQ	0.475736	-17	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	11:12	VK5FQ	0.475736	-14	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	11:02	VK5FQ	0.475736	-15	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	10:52	VK5FQ	0.475736	-21	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	10:42	VK5FQ	0.475736	-25	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	10:32	VK5FQ	0.475736	-20	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	10:22	VK5FQ	0.475736	-22	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	10:12	VK5FQ	0.475736	-19	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	10:02	VK5FQ	0.475736	-22	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	9:52	VK5FQ	0.475736	-20	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	9:44	VK5FQ	0.475736	-21	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	9:38	VK5FQ	0.475736	-25	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	9:32	VK5FQ	0.475736	-27	0	PF95gc	30	1	VK6YSF	OF88ii	2057
20/06/2018	9:26	VK5FQ	0.475736	-27	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	13:28	VK3HP	0.475612	-14	0	QF21nt	30	1	VK6YSF	OF88ii	2679
19/06/2018	13:16	VK3HP	0.475612	-19	0	QF21nt	30	1	VK6YSF	OF88ii	2679
19/06/2018	13:06	VK3HP	0.475612	-12	0	QF21nt	30	1	VK6YSF	OF88ii	2679
19/06/2018	13:00	VK3HP	0.475612	-18	0	QF21nt	30	1	VK6YSF	OF88ii	2679
19/06/2018	12:52	VK4YB	0.475796	-25	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	12:52	VK3HP	0.475611	-19	0	QF21nt	30	1	VK6YSF	OF88ii	2679
19/06/2018	12:50	VK5FQ	0.475736	-23	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	12:48	VK4YB	0.475796	-25	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	12:48	VK3HP	0.475611	-20	0	QF21nt	30	1	VK6YSF	OF88ii	2679
19/06/2018	12:44	VK4YB	0.475796	-26	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	12:44	VK5FQ	0.475736	-20	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	12:38	VK4YB	0.475796	-20	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	12:38	VK5FQ	0.475736	-17	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	12:34	VK4YB	0.475796	-24	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	12:32	VK4YB	0.475796	-21	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	12:32	VK5FQ	0.475736	-14	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	12:30	VK4YB	0.475796	-16	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	12:26	VK4YB	0.475796	-19	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	12:26	VK5FQ	0.475736	-18	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	12:20	VK5FQ	0.475736	-16	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	12:20	VK4YB	0.475796	-18	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	12:16	VK4YB	0.475797	-15	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	12:14	VK5FQ	0.475736	-12	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	11:48	VK4YB	0.475796	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	11:44	VK4YB	0.475796	-15	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	11:40	VK4YB	0.475796	-11	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	11:38	VK5FQ	0.475736	-17	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	11:36	VK4YB	0.475796	-20	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	11:34	VK4YB	0.475796	-16	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	11:32	VK5FQ	0.475736	-16	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	11:30	VK3XHM	0.475718	-28	1	QF21ov	27	0.501	VK6YSF	OF88ii	2685
19/06/2018	11:30	VK4YB	0.475796	-20	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	11:28	VK4YB	0.475797	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	11:26	VK5FQ	0.475736	-16	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	11:24	VK4YB	0.475797	-16	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	11:20	VK4YB	0.475797	-20	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	11:20	VK5FQ	0.475736	-22	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	11:16	VK4YB	0.475798	-19	-1	QG62ku	37	5.012	VK6YSF	OF88ii	3523
19/06/2018	11:14	VK5FQ	0.475736	-15	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	11:08	VK5FQ	0.475736	-16	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	11:02	VK5FQ	0.475736	-17	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	10:56	VK5FQ	0.475735	-21	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	10:50	VK5FQ	0.475736	-19	0	PF95gc	30	1	VK6YSF	OF88ii	2057
19/06/2018	10:44	VK5FQ	0.475736	-14	0	PF95gc	30	1	VK6YSF	OF88ii	2057
18/06/2018	14:04	VK4YB	0.475796	-22	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
18/06/2018	13:56	VK4YB	0.475796	-23	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
18/06/2018	13:50	VK4YB	0.475796	-22	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
18/06/2018	13:46	VK4YB	0.475796	-20	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
18/06/2018	13:40	VK4YB	0.475796	-21	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
18/06/2018	13:36	VK4YB	0.475796	-24	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
18/06/2018	13:30	VK4YB	0.475796	-22	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
18/06/2018	13:24	VK4YB	0.475796	-24	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
18/06/2018	13:20	VK4YB	0.475796	-20	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523
18/06/2018	13:20	VK3HP	0.475611	-15	0	QF21nt	30	1	VK6YSF	OF88ii	2679
18/06/2018	13:14	VK4YB	0.475796	-22	0	QG62ku	37	5.012	VK6YSF	OF88ii	3523

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Page last revised 05 May, 2025

Space Weather

https://www.swpc.noaa.gov/

Notice Board

VK6YSF JS8Call, FSQ and Olivia 8/250 operations.

Current activity is generally, however not restricted to operations with JS8Call, FSQ and Olivia 8/250 on the 20m and 40m band.

Proposed band and mode activity is often communicated on HamSpots: https://hamspots.net/js8/ or my profile on

X: https://x.com/vk6ysf97230 .

Feel free to contact me to discuss or arrange a schedule for a contact.

VK6MJM LF (136 kHz) and MF (474 kHz) Beacon

VK6MJM is a LF/MF station located in Manjimup, Western Australia.

Mode: Mode: FST4W 300 (Similar to WSPR)

Station details were presented by Peter Hall (VK6HP) at PerthTech 2024.Presentation PDF: Peter Hall VK6HP at PerthTech

QRZ Page: VK6MJM on QRZ.com

All content may be used for unlimited distribution with full credits.

Amateur Radio Station VK6YSF - Promoting amateur radio communication and experimentation.